基于GPS的四川地区现时地壳形变分析  

The analysis of present-day crustal deformation in Sichuan based on GPS

作　　者：张荣斗[1] 黄丁发[1] 廖华[2] 周乐韬[1] 赵有兵[1] 

机构地区：[1]西南交通大学土木工程学院测量系,成都610031 [2]四川省地震局减灾救助研究所,成都610014

出　　处：《测绘科学》2008年第6期30-32,共3页Science of Surveying and Mapping

基　　金：GPS基准站数据自动处理系统研制(R054321101010477);四川省十五重大科学工程项目“四川GPS观测网络”

摘　　要：对四川区域网多年数据进行处理,得到欧亚框架下的测站运动速度,采用刚性地块假设下的最小二乘拟合方法,得到川滇、川青、扬子地块的运动速度分别为(17.6±1.0)mm/a、(11.4±0.7)mm/a、(9.6±1.1)mm/a,地块运动方向逐渐由SE向SEE变化;作为川滇地块东边界的鲜水河断裂、安宁河-则木河断裂运动速度远大于龙门山断裂,显示了其较强的活动性。GPS data of long duration from Sichuan regional network were processed by GAMIT/GLOBK, and a velocity field relative to the Eurasian reference frame was obtained. Using the GPS stations velocities involved, crustal block horizontal movement velocity was estimated by least-square fitting under the hypotheses of rigid mass. The fitting result shows that the velocities of Chuan-dian, Chuan-qing and Yang-zi block are （ 17.6 ± 1.0） ram/a, （ 11.4 ± 0. 7 ） ram/a, （9. 6 ± 1.1 ） mm/a respectively and the direction of their movement changes from SE to SEE gradually. The velocities of Xianshuihe fault and Anninghe-zemuhe fault, which are eastern boundary of Chuandian block, are much larger than that of Longrnenshan fault, indicating their strong ability of activity.

关 键 词：GPS 断裂活动 地块运动 

分 类 号：P228[天文地球—大地测量学与测量工程]